This paper mainly introduces the design idea and design method of electromagnetic launcher system based on electronic sight compensation. This system uses the distance value to determine the number of driving stages of the electromagnetic launcher so as to adjust the electromagnetic fire. The value of distance and angle is used to calculate ballistic and projectile velocity. A new compensation method for electronic cross hairs is put forward in order to correct the position of cross wire on the display screen. This design uses electronic means to achieve the fall compensation according to the result of ballistic calculation. Finally an experimental prototype is developed and the functional and performance verification of this prototype is carried out. It is concluded that the ranging, aiming and shooting accuracy all meet the design requirements.